xref a PR #

llvm-svn: 123141

1 files changed, 2 insertions, 22 deletions

diff --git a/llvm/lib/Target/README.txt b/llvm/lib/Target/README.txt
index bea240c0921..e04af6f8919 100644
--- a/llvm/lib/Target/README.txt
+++ b/llvm/lib/Target/README.txt
@@ -2109,33 +2109,13 @@ aggressively as malloc though.
 
 //===---------------------------------------------------------------------===//
 
-clang -03 currently compiles this code
+clang -03 doesn't optimize this:
 
 void f1(int* begin, int* end) {
   std::fill(begin, end, 0);
 }
 
-into
-
-define void @_Z2f1PiS_(i32* %begin, i32* %end) nounwind {
-entry:
-  %cmp7.i.i = icmp eq i32* %begin, %end
-  br i1 %cmp7.i.i, label %_ZSt4fillIPiiEvT_S1_RKT0_.exit, label %for.body.i.i
-
-for.body.i.i:                                     ; preds = %entry, %for.body.i.i
-  %indvar.i.i = phi i64 [ %tmp, %for.body.i.i ], [ 0, %entry ]
-  %tmp = add i64 %indvar.i.i, 1
-  %ptrincdec.i.i = getelementptr i32* %begin, i64 %tmp
-  %__first.addr.08.i.i = getelementptr i32* %begin, i64 %indvar.i.i
-  store i32 0, i32* %__first.addr.08.i.i, align 4, !tbaa !0
-  %cmp.i.i = icmp eq i32* %ptrincdec.i.i, %end
-  br i1 %cmp.i.i, label %_ZSt4fillIPiiEvT_S1_RKT0_.exit, label %for.body.i.i
-
-_ZSt4fillIPiiEvT_S1_RKT0_.exit:                   ; preds = %for.body.i.i, %entry
-  ret void
-}
-
-It should compile it to a memset.
+int a memset.  This is PR8942.
 
 //===---------------------------------------------------------------------===//